I will admit I do not have much growing experience so this may seem like a silly question to some. I have some lettuce now growing in my system, PIFT flood and drain. After some growing pains, pun intended, my iceberg lettuce is growing strong. It has not yet formed the head but I understand by reading that this is not unusual until late in the growing process. My question is this, are the large leafs at the bottom of the stalks able to be used as leaf lettuce and thus begin to utilize these very large leafs? Yes, yes, my impatience is showing for all to see. I planted this on 8/28/13.